i got my car up to 140-150mph as well several times and never felt if it had any instability or was trying to fly off the road as my lexus does starting from 130mph+ but I was just wondering if this stock aerokit helps to any degree or not.
thanks Ron, you are most helpful, as usual - it settles issue down permanently for me. i like my car look as it is and just happy to have one less thing to waste money on.

 

Do you think the scraping is mostly due to bottom lip? or the whole front bumper hangs lower?

It looks like new GTS lip can replace the GT3/Aerokit lip and looks like it is shorter.



http://www.suncoastparts.com/product//50598305.html

 

Maybe late to the discussion, but anyway;

First;
Note that the OEM 997.1 Aerokit front bumper may look identical to the GT3 one but it's aerodynamical properties are not. The key part of the improved aerodynamics of the GT3 is the additional went that directs the air passing through the center rad out over the hood instead of under the car as on the Carrera's with center rad.

Second;
The 997.1 Carrera's are from the start actually better areodynamically wise vs 997.2: -20/-7 vs. -24/-14
(kg's of front/rear axle preassure @ 200 km/h where ´-´ means lift):
http://www.sportauto-online.de/super...e-1347921.html

Third;
I don't know much about what's cost effective in the US, but if you want an easier install then a OEM GT3 bumber, have a look at the Manthey Racing front lip wich neutralizes front lift. Being a company with close relations to Porsche Motorsport and mainly focusing on race cars, rest assured that their offer is fully verified:
http://www.manthey-motors.de/nextsho...docid=16&e1=54

I beleive products of similar design are avaliable from others, Cargraphic being one of them.


Then as already been said, if it's noticable or not is an entirely different question. Probably only on tracks with really high speed corners or straight lines at high speed in windy conditions.

 

thanks 964RS - I am aware of costs to install GT3 front bumper as you are exactly right about those new ducts - they will require radiator change, some new mounts and hoses, it is plenty of work actually and if one simply bolts on gt3 bumper it works worse than stock bumper. that is exactly why I was wondering about stock C2S bolt-on aerokit and how it does affect stock car.

I think to put a lip on, as of what specific lip - looking at them they are all the same to me. unless it is a foot long front splitter made from a piece of plywood I do not think it will be much of a difference, they all look alike to me.

I am not sure which one to choose, does anybody know which one is the cheapest? I afraid I will torn it off on a second week after I put it on anyway , so, do not really want to pay for anything extravagant.